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<div class="note">
This API call is not fully portable because the va_end() macro in the calling
code may never be reached (e.g. due to an error throw).  Some implementations
rely on va_end() to e.g. free memory allocated by va_start(); see
<a href="https://stackoverflow.com/questions/11645282/do-i-need-to-va-end-when-an-exception-is-thrown">https://stackoverflow.com/questions/11645282/do-i-need-to-va-end-when-an-exception-is-thrown</a>.
However, such implementations are rare so this isn't usually a practical concern.
</div>
</div>
